2000rpm
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The speed rating I mentioned is what sdcard.org says for Class 10 cards, not what Kingston, Transcend, Samsung or any other manufacturer says. If you're saying that's how sdcard.org achieve those numbers, then no card is compatible with dashcams, right?
Just out of curiosity, yesterday I tested my Kingston card with h2testw against the Transcend cards supplied with the SG9665XS. The Kingston's write speed was 10~11MB/s, while the Transcends all tested between 13 and 14MB/s. I don't know where you got the idea that Kingston cards are faster. If this test counts for something, the Kingston card would be an ultra marathon runner, not a sprinter. In any case, what matters to this discussion is that a Class 10 card's write speed is high enough for the demands of any dashcam. I can't even imagine what the camera's bitrate would have to be for its write speed to exceed even a Class 10 Kingston's "low" write speed.
Correct: no memory card has been designed with dashcams in mind. They were designed for phone and computer-type use which isn't continuous writing. That's why some card companies explicitly mention that their warranty is not valid if the card is used in a dashcam.
In some tests I saw in a magazine a couple of years ago, Kingston were highly rated for speed as well as being a bargain price. I haven't looked at their recent products.
The bottom line is that some memory cards don't cope with the heavy-duty requirements of a dashcam and from what I've seen Kingston are among the most likely to struggle or fail prematurely with dashcam use whereas Transcend and Samsung are among the least likely to struggle.